修改android系统默认字体大小

http://blog.chinaunix.net/uid-29535415-id-4150770.html

android系统字体大小在“设置” 中“显示”中“字体大小”设置，一共提四种等级设置：小 、普通 、 大、 超大

四种等级选择相应配置代码位置

packages/apps/setttings/res/values/arrays.xml

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<string-array name="entries_font_size">

<item msgid="6490061470416867723">Small</item>

<item msgid="3579015730662088893">Normal</item>

<item msgid="1678068858001018666">Large</item>

<item msgid="490158884605093126">Huge</item>

</string-array>

<string-array name="entryvalues_font_size" translatable="false">

<item>0.85</item>

<item>1.0</item>

<item>1.15</item>

<item>1.30</item>

</string-array>

以上配置是通过如下代码加载后供给终端用户选择

packages/app/settings/DisplaySettings.java

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public void readFontSizePreference(ListPreference
pref) {

try {

mCurConfig.updateFrom(ActivityManagerNative.getDefault().getConfiguration());

} catch (RemoteException e) {

Log.w(TAG, "Unable
to retrieve font size");

}

// mark the appropriate item in the preferences list

int index = floatToIndex(mCurConfig.fontScale);

pref.setValueIndex(index);

// report the current size in the summary text

final Resources res = getResources();

String[] fontSizeNames = res.getStringArray(R.array.entries_font_size);

pref.setSummary(String.format(res.getString(R.string.summary_font_size),

fontSizeNames[index]));

}

在frameworks层会对系统的字体大小设置一个默认值，字体放缩比例为1，也就是对应显示设置中的“普通”字体

frameworks/base/core/java/android/content/res/Configuration.java

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/**

* Set this object to the system defaults.

*/

public void setToDefaults() {

fontScale = 1;
//此处赋值为默认字体的放缩比例

mcc = mnc = 0;

locale = null;

userSetLocale = false;

touchscreen = TOUCHSCREEN_UNDEFINED;

keyboard = KEYBOARD_UNDEFINED;

keyboardHidden = KEYBOARDHIDDEN_UNDEFINED;

hardKeyboardHidden = HARDKEYBOARDHIDDEN_UNDEFINED;

navigation = NAVIGATION_UNDEFINED;

navigationHidden = NAVIGATIONHIDDEN_UNDEFINED;

orientation = ORIENTATION_UNDEFINED;

screenLayout = SCREENLAYOUT_UNDEFINED;

uiMode = UI_MODE_TYPE_UNDEFINED;

screenWidthDp = compatScreenWidthDp = SCREEN_WIDTH_DP_UNDEFINED;

screenHeightDp = compatScreenHeightDp = SCREEN_HEIGHT_DP_UNDEFINED;

smallestScreenWidthDp = compatSmallestScreenWidthDp = SMALLEST_SCREEN_WIDTH_DP_UNDEFINED;

densityDpi = DENSITY_DPI_UNDEFINED;

seq = 0;

}